Best courses to revise SQL in 2 days?

I am customer support engineer intern. My supervisor has assignmed me to learn SQL in 2 days. I've studied mysql in the past as well. https://www.w3schools.com/sql/ He has asked me to learn till SQL data types. Are there any video courses to revise my sql using mysql? Remember that this is for customer support engineer job so I don't require very vast knowledge of SQL, there'll be DBAs for that. I'm considering this course. Do tell me if I should buy it or not. This is by far the best course I've found. https://www.udemy.com/course/practical-sql-masterclass-with-mysql/ My second preference is this course: https://www.udemy.com/course/the-complete-sql-master-bootcamp-sql-database-beginner-to-mysql-expert/ Tell me which one should I buy? None? If None, which?